Mixing apparatus



March 19, 1929. P. LENART MIXING APPARATUS Filed Dec. 17, .1927

Patented Mart 19, 192 9,

PATENT OFFICE.

PAUL LEN-ART, OI COLOGNE, GERMANY.

' MIXING APPARATUS.

epplioationfllegl December 17, 1927, Serial No. 240,732, and in GermanyDecember 28, 1926.

The invention relates to mixing apparatus comprising two containersarranged one within another and with which the materials to be mixedleaving the inner container at 5 the bottom are supplied again to thiscon-' tainer in a cycle by means of a centrifugal disk on the waythrough the annular space existing between the inner and outercontainer. Mixing apparatus of this type have 1o turned out very well inpractice in all cases where the most intimate possible distribution ofpowdered or grained substances in liquids is to be obtained, as withthese apparatus only a fraction of the time required with the hithertoknown mixing apparatus,

and a lower consumption of ower is required, to obtain a completelyliomogeneous mixture. Now my invention has for itsobject to so improvemixing apparatus of this type as to enable a further acceleration of themixing procedure and a raise ofthe mixing intensity, and to afford atthe same time the ossibility of treating with the same good e ect largeror smaller quantities in one and the same mixin apparatus. These objectsare obtained pnmaril by the fact, that apertures are provide in the wallof the inner container, the passage area of which apertures isadjustable, these apertures permitting a suitable portion of thematerials'to be mixed to directly pass from the annular space into theinner container. This arrangement affords the possibility of using theap- 5 paratus even when only its bottom is covered with the materials,as in this case the materials need to rise only to the aperturesprovided in the inner container,'to describe the cycle, which wouldbe'impossible when, as hitherto the li uid would have to rise to theupper edge of t e inner container. But even with the mixing apparatusbeing normally filled the said apertures in the wall of the innercontainer aflford an important advantage, as they make'a greater or lessproportion of the liquid enter the inner contalner laterally, accordingto the more-or less free passage area of the apertures. The divisionalliquid currents thus obtained, which flow 5 into the inner container indiflt'erent directions, cause an intense whirling and therebyconsiderably improve the mixin effect. When the apertures are furtherdesi ed as slots and guide plates are arranged in cone. g. by the drive'14. This disk in? 1 nection with them of 'a configuration of turbineguide blades, the material circulating in the annular space enters theinner container through the slots ininverse direction, whereby themixing eflect is-still further im roved. The guide plates can be made'ad ustable, to regulate both the passage area and the direction of thecurrents.

In order that my invention may be more easily understood, some referredembodiments of the same are illustrated in the drawing which accompaniesand forms part of this specification. In this drawing:

Figure 1 is a vertical section through my improved mixing apparatus,

Figure 2 is a section on line IIII of Figure 1,

Figures 3 and 4 are corresponding sections through somewhat modifiedapparatus, and

Figures 5 and 6 showtwo constructions of the centrifugalizing disk.

Referring to these Figures, 9 denotes the outer container or shell ofthe apparatus and 10 the inner container which has a bottom aperture 11closed by a sieve plate 12. To avoid dead s aces, the wall of the innercontainer lO su sides with a suitable curvature into the bottom.Underneath the sieve bottom' 11 is arranged a centrifugalizing disk 13which is rotated in an suitable minner,

e esigned like a fan, as illustrated in gure 5, or as a real disk, asshown in Figure 6, which disk has blades 15 and 16 on both sides, andopenings 17. Openings, preferably slots 18 are provided in the wall ofthe inner container 10, which slots either have no regulating means, or,are e uipped, as shown in Figure 2, with turbine lade-like guide plates19, bywhich the liquid circulating in the annular space is led throughthe. slots 1 8 into the inner container in reversed direction. Asillustrated in Figure 4, these guide plates can be made adjustable, bymounting them rockingly on pins 20 and connectin them to a commonadjusting ring 22 e. g. y means of links 21. A clamping means w23 may berovided for ring'22,to'adjust it from outsi e, so that the possibilityis 'ven to regulate both the passage area of, e slots 18 and the guideangle of the plates 19.

As can be seen from Fi plates may be dispensed wlth and slides 24 re 3the guide -.it returnsto the inner container over' the A may bearrangedto vary their passage area.

The slides 24 maybe adjusted either individually or in common. I

The described mixing apparatus operates as follows:

The material supplied to the apparatus and consisting of a liquidandr'pulverous or grained substances, fills the apparatus about up tothe level denotedby 26. Now when the centrifugalizing disk 13 is set inrotation, the liquid with the solid substances is delivered from theinner container into the annular space existing between the inner andouter container in the direction of the arrows, Figure 1, and'riseinthis annular space until upper edge thereof, and describes thus acycle. I

At the same time, according to the adjusted passage area of the slots18, a portion of the material enters the inner container directlythrough these slots. A manifold subdivision of the material partaking ofthe cycle is thus obtained, and'a subsequent reunion thereof in theinner container 10, whereby the mixin effect. is considerably improved.This e ect is still further increasedby arranging the guide plates shownin Figures 2 and 4 that cause the material entering the container 10through the slots 18 to undergo a deflection in the direction a of thearrows, Figures 2 and 4.

When the apparatus is filled only partially, e. g. about up to the level27 only, then it is impossible in itself, for the liquid to return tothe inner container over the upper edge thereof, becausethe liquidquantity is too small to fill the annular space up to said upper edge.In this case the whole material enters the inner container through theslots 18. These slots thus enable the cycle, which forms the essentialfeature of the operation, to beattained also with an incomplete fillingof the apparatus, so that the range of use'of one and the same apparatusis nolably' enlarged. 'When the liquid contains ore1 with rawing thesieve ottom 12, by lifting .it. This can be executed even during theoperation of the apparatus.-

What I claim, is Y Y 1. A mixing apparatus comprising two containersarranged one within the other and with the inner one spaced from theother at sides and bottom to form an annular space between them, saidinner container having openings in its bottom, and means for pump-.

ing the" material to be mixed downward throu h said bottom openings andupward in sai annular space, said inner container being provided withopenings in its side walls adapted to permit the material to flow backinto said inner container from said an nular space.

2. A mixing apparatus in accordance with substances, the can be removedby,

claim 1 in which said pumping means comprises a centrifugal arrangedbetween the I its side walls adapted to permit the material to flowbackinto said inner container from said annular space.

4. A mixing. apparatus comprising two containers arranged one within theother and with the inner one spaced from the other at sides and bottomto form an annular space between them, said inner container havingopenings in its bottom, means 'for pumping the material to be mixeddownward through said bottom openings and upward in said annular space,said inner containerbeing provided with openings in its side wallsadapted to permit the material to flow back into said inner containerfrom said annular space, and means for varying the sectional area ofsaid side openings.

5. A mixing apparatus comprising. two containers arranged one ,withinthe other and with the inner one spaced from the other at sides andbottom to form an annular space between them, said inner containerhav'in openings in its bottom, means for pumping the material to bemixed downward through said bottom openings and upward in said annularspace, said lnner container being provided with openings in its sidewalls adapted to permit the material to flow back into saidinnencontainer from said an nular space, and guide plates mounted nearsaid side openings adapted to control the direction of flow of materialpassing through the same;

.6. A- xing apparatus comprising two containers arranged one within theother and with the inner one spaced from the other at sides and bottomto form an annular space between them, said inner container having 0enings in itsbottom, means for pumping t e material to be mixed downwardthrough said bottom openings and upward in said annular space, saidinner container being provided with openings in its side walls adaptedto permit the material to flow back into said inner container from saidannular space, means for varying the sectional area of said sideopenings, and guide plates at saidside openings adapted to control thedirection of flow of material passing throu h the same.

7. mixing ap aratus comprising two containers arrange one within theother and Side walls adapted to permit the material to flow back intosaid inner container from said annular space, and guide plates atsaidside openings for varying the sectional area thereof and forcontrolling the direction of flow of material passing therethrough.

8. A mixing apparatus comprising two containers arranged one within theother and with the inner one spaced from the other at sides and bottomto form an annular space between them, said inner container havingopenings in its bottom; means for pum ing the material to be mixed'downwar through said bottom openin s and upward in said annular space,sai inner container being provided with openings in its side wallsadapted to permit the material to flow back into said inner containerfrom said annular space, guide plates mounted near said side-openingsand adapted to control the direction of flow of material passing throughthe same, and means for adjusting said glide plates.

9.- mixing apparatus comprising two containers arrange one within theother and with the inner one spaced from the other at sides andbottom toform an annufor gumping the material to be mixed downwar through saidbottom openings and up-" ward in said annular space, "said innercontainer being provided with openings in its side walls adaptedtopermit the material to flow back into said inner container from saidannular space, the side walls of. said inner container curving graduallyinto the bottom walls thereof.

.10. A mixing ap aratus comprising two containers arranged one withinthe other and with the inner one spaced from the other at sides andbottom to form an annular space between them, said inner containerhaving an openingin its bottom, an easily detachable sieve fitted intosaid opening, means for pumping material to be mixed downward throughsaid sieve and upward in said annular space, and openings in the sidewalls of said inner container adapted to permit the material to flowback into said inner container from said annular space.

11. A mixing apparatus in accordance withv claim 1 in which said pumpingmeans consists of a disk having upper and lower centrifugal ribs andopenings cooperating with those inthe bottom of said inner container,said disk being arranged between the bottoms of said twocontainers.

12. A mixing ap with claim 8 inwhic said adjusting means comprises aring mounted concentrically with said containers, a link connecting eachof said guide plates with said ring, and means accessible from theoutside for adjusting said ring circumferencially. lar space betweenthem, said inner container having 0 emngs in its bottom, and means Intestimony whereof the foregoing specification is signed.

PAUL LENART.

aratus in accordance

